void main() {
  for (int i = 0; i < 10; i++) {
    print(i);
  }

  var students = ["Some", "Flut", "哈哈", "笑"];
  for (var student in students) {
    print(student);
  }

  var num = 10;
  while (num >= 1) {
    num--;
  }

  List<int> scores = [20, 50, 75, 30, 80, 100];
  for (int score in scores.where((s) => s > 50)) {
    print("大于50的: $score");
  }
}
